ValuesCollectionAccessor.cs

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namespace System.Collections.Immutable;
 
internal sealed class ValuesCollectionAccessor<TKey, TValue> : KeysOrValuesCollectionAccessor<TKey, TValue, TValue> where TKey : notnull
{
    internal ValuesCollectionAccessor(IImmutableDictionary<TKey, TValue> dictionary)
        : base(dictionary, dictionary.Values)
    {
    }
 
    public override bool Contains(TValue item)
    {
        if (base.Dictionary is ImmutableSortedDictionary<TKey, TValue> immutableSortedDictionary)
        {
            return immutableSortedDictionary.ContainsValue(item);
        }
        if (base.Dictionary is IImmutableDictionaryInternal<TKey, TValue> immutableDictionaryInternal)
        {
            return immutableDictionaryInternal.ContainsValue(item);
        }
        throw new NotSupportedException();
    }
}